Watch List notes:

Augustus. 27 B.C.-A.D. 14 AR denarius (18 mm, 3.31 g, 5 h). Lugdunum, 15-13 B.C. AVGVSTVS DIVI F, bare head of Augustus right / IMP X, bull butting left. RIC 169; BMC 458; RSC 141. Edge chip and banker's mark on neck. Very fine.

The denarii of Augustus with the charging or butting bull are quite common. However, those with the bull butting left as here are much rarer than those with the bull butting right.